Chinese Optics Letters, 2007, 5 (11): 677, Published Online: Nov. 14, 2007
Photoacoustic spectroscopy for fast and sensitive ammonia detection Download: 788次
光声光谱 氨气检测 共振光声池 二氧化碳激光器 300.6430 Spectroscopy, photothermal 300.6360 Spectroscopy, laser 140.1340 Atomic gas lasers 300.6390 Spectroscopy, molecular
Abstract
A photoacoustic (PA) spectrometer with H-type first longitudinal resonant cells for ammonia detection is developed. A new PA cell structure is designed to accelerate the drift velocity of the sample gas near the cell surface, so that the short response time at the flow rate of 100 sccm (standard cubic centimeter per minute) is achieved. The response time of 5 min and detection limit of 0.86 ppbv is reached for ammonia concentration measurement with a Teflon polytetrafluoroethylene (PTFE) cell. Further improvement could be expected when using a brass cell with a high quality Teflon fluorinated ethylene propylene (FEP) coating.
Wang Zhang, Zhiying Wu, Qingxu Yu. Photoacoustic spectroscopy for fast and sensitive ammonia detection[J]. Chinese Optics Letters, 2007, 5(11): 677.